Performance of clay stabilized by cementitious materials and inclusion of zeolite/alkaline metals-based additive

Eyo Umo Eyo; Samson Ngambi; Samuel Abbey

doi:10.1016/j.trgeo.2020.100330

Performance of clay stabilized by cementitious materials and inclusion of zeolite/alkaline metals-based additive

Eyo Umo Eyo
, Samson Ngambi
, Samuel Abbey

University of the West of England

Research output: Contribution to journal › Article › peer-review

61 Citations (Scopus)

573 Downloads (Pure)

Abstract

RoadCem (RC) is a by-product additive produced based on nanotechnology and comprises of synthetic zeolites and alkali earth metals as some of its components. The geotechnical properties of a soil stabilized by adding RC to partly replaced cementitious materials are studied. Various combinations of the additives were investigated with the objective of reducing the amount of OPC by 50% by an inclusion of RC and ground granulated blast furnace slag (GGBS) in the stabilized soil. Laboratory studies involving index property testing, oedometer swell-deformation, unconfined compression tests and microstructural examinations were carried out on both the natural and 7-& 28- day cured samples of the stabilized soil. The influence of RC on the mechanical properties of the stabilized soil was examined by comparing the performance of the stabilized soil mixtures that contain the RC and the mixtures without the RC added. Results indicated the positive effect of RC as noticed by the tremendous strength gain in 7 days with the OPC reduced by 50% in the stabilized soil. Swelling decreased significantly to 0% after 28 days curing with the settlement also reasonably reduced for nearly all the percentages of the OPC substituted. The stabilized soil’s microstructure revealed the mechanism of cementation observed as an encapsulation or “wrapping effect” as a result of the presence of RC. A comparison of the RC-modified soil containing the by-products GGBS and PFA indicated that GGBS was more effective in the enhancement of engineering properties than PFA. Overall, as well as meeting some of the standards set for road pavement applications, the results obtained from this research are very promising for the ongoing discussions on reducing carbon foot-printing by OPC replacement.

Original language	English
Article number	100330
Journal	Transportation Geotechnics
Volume	23
Early online date	6 Feb 2020
DOIs	https://doi.org/10.1016/j.trgeo.2020.100330
Publication status	Published - Jun 2020

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Transportation Geotechnics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Transportation Geotechnics, 23, (2020) DOI: 10.1016/j.trgeo.2020.100330

© 2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

Cement
Compressive strength
Fly ash
Ground granulated blast furnace slag
RoadCem
Swell

ASJC Scopus subject areas

Civil and Structural Engineering
Transportation
Geotechnical Engineering and Engineering Geology

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10.1016/j.trgeo.2020.100330

Post-PrintAccepted author manuscript, 1.88 MBLicence: CC BY-NC-ND

Cite this

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title = "Performance of clay stabilized by cementitious materials and inclusion of zeolite/alkaline metals-based additive",

abstract = "RoadCem (RC) is a by-product additive produced based on nanotechnology and comprises of synthetic zeolites and alkali earth metals as some of its components. The geotechnical properties of a soil stabilized by adding RC to partly replaced cementitious materials are studied. Various combinations of the additives were investigated with the objective of reducing the amount of OPC by 50\% by an inclusion of RC and ground granulated blast furnace slag (GGBS) in the stabilized soil. Laboratory studies involving index property testing, oedometer swell-deformation, unconfined compression tests and microstructural examinations were carried out on both the natural and 7-\& 28- day cured samples of the stabilized soil. The influence of RC on the mechanical properties of the stabilized soil was examined by comparing the performance of the stabilized soil mixtures that contain the RC and the mixtures without the RC added. Results indicated the positive effect of RC as noticed by the tremendous strength gain in 7 days with the OPC reduced by 50\% in the stabilized soil. Swelling decreased significantly to 0\% after 28 days curing with the settlement also reasonably reduced for nearly all the percentages of the OPC substituted. The stabilized soil{\textquoteright}s microstructure revealed the mechanism of cementation observed as an encapsulation or “wrapping effect” as a result of the presence of RC. A comparison of the RC-modified soil containing the by-products GGBS and PFA indicated that GGBS was more effective in the enhancement of engineering properties than PFA. Overall, as well as meeting some of the standards set for road pavement applications, the results obtained from this research are very promising for the ongoing discussions on reducing carbon foot-printing by OPC replacement.",

keywords = "Cement, Compressive strength, Fly ash, Ground granulated blast furnace slag, RoadCem, Swell",

author = "Eyo, \{Eyo Umo\} and Samson Ngambi and Samuel Abbey",

note = "NOTICE: this is the author{\textquoteright}s version of a work that was accepted for publication in Transportation Geotechnics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Transportation Geotechnics, 23, (2020) DOI: 10.1016/j.trgeo.2020.100330 {\textcopyright} 2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ ",

year = "2020",

month = jun,

doi = "10.1016/j.trgeo.2020.100330",

language = "English",

volume = "23",

journal = "Transportation Geotechnics",

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TY - JOUR

T1 - Performance of clay stabilized by cementitious materials and inclusion of zeolite/alkaline metals-based additive

AU - Eyo, Eyo Umo

AU - Ngambi, Samson

AU - Abbey, Samuel

N1 - NOTICE: this is the author’s version of a work that was accepted for publication in Transportation Geotechnics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Transportation Geotechnics, 23, (2020) DOI: 10.1016/j.trgeo.2020.100330 © 2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

PY - 2020/6

Y1 - 2020/6

N2 - RoadCem (RC) is a by-product additive produced based on nanotechnology and comprises of synthetic zeolites and alkali earth metals as some of its components. The geotechnical properties of a soil stabilized by adding RC to partly replaced cementitious materials are studied. Various combinations of the additives were investigated with the objective of reducing the amount of OPC by 50% by an inclusion of RC and ground granulated blast furnace slag (GGBS) in the stabilized soil. Laboratory studies involving index property testing, oedometer swell-deformation, unconfined compression tests and microstructural examinations were carried out on both the natural and 7-& 28- day cured samples of the stabilized soil. The influence of RC on the mechanical properties of the stabilized soil was examined by comparing the performance of the stabilized soil mixtures that contain the RC and the mixtures without the RC added. Results indicated the positive effect of RC as noticed by the tremendous strength gain in 7 days with the OPC reduced by 50% in the stabilized soil. Swelling decreased significantly to 0% after 28 days curing with the settlement also reasonably reduced for nearly all the percentages of the OPC substituted. The stabilized soil’s microstructure revealed the mechanism of cementation observed as an encapsulation or “wrapping effect” as a result of the presence of RC. A comparison of the RC-modified soil containing the by-products GGBS and PFA indicated that GGBS was more effective in the enhancement of engineering properties than PFA. Overall, as well as meeting some of the standards set for road pavement applications, the results obtained from this research are very promising for the ongoing discussions on reducing carbon foot-printing by OPC replacement.

AB - RoadCem (RC) is a by-product additive produced based on nanotechnology and comprises of synthetic zeolites and alkali earth metals as some of its components. The geotechnical properties of a soil stabilized by adding RC to partly replaced cementitious materials are studied. Various combinations of the additives were investigated with the objective of reducing the amount of OPC by 50% by an inclusion of RC and ground granulated blast furnace slag (GGBS) in the stabilized soil. Laboratory studies involving index property testing, oedometer swell-deformation, unconfined compression tests and microstructural examinations were carried out on both the natural and 7-& 28- day cured samples of the stabilized soil. The influence of RC on the mechanical properties of the stabilized soil was examined by comparing the performance of the stabilized soil mixtures that contain the RC and the mixtures without the RC added. Results indicated the positive effect of RC as noticed by the tremendous strength gain in 7 days with the OPC reduced by 50% in the stabilized soil. Swelling decreased significantly to 0% after 28 days curing with the settlement also reasonably reduced for nearly all the percentages of the OPC substituted. The stabilized soil’s microstructure revealed the mechanism of cementation observed as an encapsulation or “wrapping effect” as a result of the presence of RC. A comparison of the RC-modified soil containing the by-products GGBS and PFA indicated that GGBS was more effective in the enhancement of engineering properties than PFA. Overall, as well as meeting some of the standards set for road pavement applications, the results obtained from this research are very promising for the ongoing discussions on reducing carbon foot-printing by OPC replacement.

KW - Cement

KW - Compressive strength

KW - Fly ash

KW - Ground granulated blast furnace slag

KW - RoadCem

KW - Swell

UR - https://www.scopus.com/pages/publications/85079122069

U2 - 10.1016/j.trgeo.2020.100330

DO - 10.1016/j.trgeo.2020.100330

M3 - Article

SN - 2214-3912

VL - 23

JO - Transportation Geotechnics

JF - Transportation Geotechnics

M1 - 100330

ER -

Performance of clay stabilized by cementitious materials and inclusion of zeolite/alkaline metals-based additive

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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